Apparatus for aligning armature-core lamine



March 6, 1928. 1,661,342

W. E. F'ABST APPARATUS FOR ALIGNING ARMATURE CORE LAMINE Filed A119; 21.1926 2 Sheets-$heet l gw mm 3 MYA 2 Gamma,

Patented Mar. 6, 1928.

UNITED STATES PATENT OFFICE.

WILLIAM E. PABST, OF ANDERSON, INDIANA, ASSIGNOR, BY MESNE ASSIGNMENTS,TO DELCO-REMY CORPORATION, OF DAYTON, OHIO, A CORPORATION OF DELAWARE.

APPARATUS FOR ALIGNING ARMATURE-CORE LAMINE.

Application filed August 21, 1926. Serial No. 130,617.

This invention relates to the manufacture of armatures fordynamo-electric machines and particularly to armatures having slottedcores composed of a number of thin plates or laminations assembled upona shaft.

In the manufacture of armatures it has been the practice to form thecore by assembling a plurality of similar punchings upon a shaft havingpreferably a straight knurled portion which receives the punchings.Unless extreme care is taken in maintaining the punchings in alignmentwith each other when they are forced upon the shaft, the punchings willnot be in perfect alignmentconsequently the surface bounding the coreslots will be irregular and rough. This condition interferes withassembling core slot insulation and armature conductors especially in aprocess of manufacture in which the slot lining members and theconductors are inserted through the slots lengthwise of the armature.

One of the objects of the present invention is to provide an apparatusfor aligning the laminae of armature cores or for truing the slots of alaminated armature core prior to assembling of slot lining insulationand conductors.

Futher objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawings, wherein a preferred form of embodiment of the presentinvention is clearly shown.

In the drawings:

Fig. 1 is a plan view partly in section of apparatus constructed inaccordance with the present invention.

Fig. 2 is a fragmentary view on a larger scale than Fig. 1 showing aportion a laminated armature core having its core laminations slightlydisplaced angularly.

Fig. 3 is a view similar to Fig. 2 showing the core after being operatedupon by the apparatus shown in Fig. 1.

Fig. 4 is a longitudinal sectional view of the apparatus shown in Fig.1.

Figs. 5 and 6 are end and side views respectively of one of the membersfor applying pressure to one of the truing discs.

Figs. 7 and 8 are side and edgewise views respectively of one of thetruing discs.

The apparatus comprises chiefly, means for guiding the core for endwisemovement thereof, devices such as rotatable discs adapted to be receivedby the core slots for progressively displacing the laminations of thecore angularly in order to force them into alignment, and means forpressing the core against the truing device.

The guiding means or fixture comprises a base 20 upon which is mounted aring 21 surrounding a block 22 which is provided with a plurality ofradially disposed grooves 23. The bottom surface 24 of each groovesupports a hub 25 of a truing disc 26 having parallel plane sides aperiphery 27 which is preferably rounded or so shaped that it is adaptedto progressively enter the slots of laminations which are slightlyangularly displaced. The block 22 is provided with a plurality ofradially disposed notches each of which is adapted to provide clearancefor free movement of a disc 26. The base 20 and the block 22 areprovided with aligned openings 29 and 30 which are adapted to receive alaminated armature core 31 which is assembled upon a shaft 32. Theopening 30 is surrounded by an annular wall 33 provided by the block 22.

Each disc 26 rotates about an axis at right angles to the axis of theshaft 32 and is yieldingly urged toward the shaft due to pressureapplied by a screw 34 and transmitted to the hub 25 of the disc'26through a metal plate 35, a resilient rubber block 36 and a bifurcatedblock 37 each branch of which is provided with a semicircular notch 38for receiving each end portion of the hub 25. The members 36 and 37 areslidable within the grooves 23, and, together with the disc hubs 25, aremaintained within the grooves by a cover plate 39 which is attached byscrews 40 to the block 22. The cover plate 39 is provided with anopening 41 which is in alignment with the openings 29 and 30 when thecover is attached to the block 22. Thus the base 20, the block 22 andthe cover 39 provide a fixture for guiding the core during endwisemovement thereof. The base 20 is adapted-to be mounted upon a horizontalbed or table of a punch press.

The core 31 is forced into engagement with the truing discs 26 andthrough the central openings in the fixture by a member which is adaptedto be attached to the movable head of a punch press. The member 50 isprovided with a central bore 51 to provide clearance for one end of thearmature shaft 32. The bottom surface of the member 50 is coextensivewith the upper surface of the armature core, and is provided with slots52 located in alignment with the slots of the core 31 so that clearancewill be provided for the truing disks 26.

Downward movement of the member 50 causes the core 31 to be forcedthrough the openings 41, 30 and 29. During the movement of the corerelative to the fixture each truing wheel or disk 26 will be received bya core slot beginning at one end or the bottom of the core and at apoint adjacent the periphery of the core. its the core 31 is moveddownwardly its laminations will be successively engaged by the truingdisks so that its laminations 31" which may be slightly out of alignmentas shown in Fig. 2 will be moved into more perfect alignment as shown inFig. 3. As the core 81 is moved downwardly or as relative bodilymovement is produced between the core and the truing disks the point ofapplication of the pressure by each truing disk upon the laminationswill move progressively from the periphery toward the bottom or innerend of the core slot. The periphery 27 of each dish 26 is rounded or soshaped that it may enter successively the slots of the slightlydisplaced laminae of the core and cause them to be displaced angularlyand to be brought into more perfect alignment. It will be noted that thetruing disk will engage a plurality of laminae simultaneously. At thetime the disk is entering the slot of a certain lamina the disk hasalready progressed toward the bottom or inner end of the slots ofpreceding laminae. The truing operation may be car ried on withrelatively small effort and at relatively high speed because the lamina:are successively engaged by the truing disks and pressure is appliedinitially at a point most remote from the axis about which the laminaeare displaced in order to bring them more nearly into perfect alignment.

The truing wheels not only function to shift the laminae or armaturepunchings into more'perfect alignment, but also smooth the sides of thearmature core teeth which define the core slots. While metal may not beactually removed from the core teeth, small projections of metal such asburrs may be rubbed into the minute crevices between the laminae.

While the form of embodiment of the present invention as hereindisclosed, constitutes a preferred form, it is to be understood thatother forms might be adopted, all coming within the scope of the claimswhich follow.

What is claimed is as follows:

1. Apparatus for truing the slots of a laminated armature core assembledupon a shaft comprising, in combination, means for guiding the core forendwise movement, devices adapted to be received by the core slots forprogressively displacing the laminations of the core angularly in orderto force them into alignment, and means for pressing the core againstsaid devices.

2. Apparatus for truing the slots of a laminated armature core assembledupon a shaft comprising, in combination, means for guiding the core forcndwise movement, devices adapted to be received by the corslots forprogressively displacing the laminationsof the core angularly'in orderto force them into alignment, and means exerting iressure upon the endof the core and surfaces thereof adjacent the slots for pressing thecore against said devices. I

3. Apparatus for truing the slots of a laminated armature core assembledupon a shaft comprising, in combination, means for guiding the core forendwise movement, devices adapted to be received first by the core slotsbeginning at one end of the core and adjacent the periphery thereof, andadapted progressively to engage the laminations and to displace themangulariy relative to the shaft, the point of application of pressureapplied by each device starting adjacent the core periphery and movingtoward the bottom of the slot which receives it, and means for pressingthe core against said devices.

4. Apparatus for truing the slots of a laminated armature core assembledupon a shaft comprising, in combination, means for guiding the core forendwise movement, a plurality of rotatably supported discs each adaptedto be received by a core slot and having a. periphery shapedprogressively to enter the slightly displaced slots of the laminationsand to move the laminations angularly into alignment, the application ofpressure by the disc progressing from the periphery to the bottom of theslot, and means for producing relative movement be tween the core andsaid discs axially of the core.

5. Apparatus for truing the slots of alaminated armature core assembledupon a shaft comprising in combination, a fixture for guiding the corefor endwise movement, a plurality of truing discs each adapted to bereceived by a core slot, said discs being supported by the fixture forrotation at right angles to the axis of the core devices for yieldinglyurging the discs toward the core, and means for producing relativemovement between the core and said discs axially of the core.

In testimony whereof I hereto aliix my signature.

"WILLIAM E. PABST.

